CHICAGO (AP) - Authorities said Tuesday that an attack in which a 6-month-old girl was fatally shot and her father was wounded was apparently gang-related, and that they are searching for the gunman and the driver of the getaway van.

Jonylah Watkins was shot five times during the Monday afternoon attack in the South Side neighborhood of Woodlawn. She died Tuesday morning at Comer Children's Hospital, police said.

Her father, Jonathan Watkins, was in serious but stable condition, recovering at Northwestern Memorial Hospital from wounds to his side, buttocks and face, which was only grazed, police said.

Witnesses said the attacker approached Jonathan Watkins around 1 p.m. while he was standing beside his minivan and changing his daughter's diaper. She was on the front seat. Her family said Jonylah was shot in the thigh, shoulder, lung, liver and bowels.

Jonathan Watkins belongs to a gang and has a long criminal history, and Monday's attack appears to have been gang-related, McCarthy said at a Tuesday news conference. He said police weren't sure yet whether Watkins will decide to cooperate in the investigation.

"No child, certainly not an infant, should be a victim of gang violence," McCarthy said.

Authorities found surveillance video of the blue van in which they believe the attacker fled. They believe a driver waited in the van during the shooting.

McCarthy said police flooded the neighborhood Monday night to prevent a retaliatory attack over the infant girl's shooting.